Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
  • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
  • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
  • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
  • G06F1/26—Power supply means, e.g. regulation thereof
  • G06F1/263—Arrangements for using multiple switchable power supplies, e.g. battery and AC
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
  • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
  • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
  • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
  • G06F3/0416—Control or interface arrangements specially adapted for digitisers
  • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
  • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
  • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
  • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
  • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
  • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
  • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
  • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
  • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
  • G06F3/03547—Touch pads, in which fingers can move on a surface
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
  • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
  • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
  • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
  • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
  • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
  • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
  • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
  • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries

Definitions

• High common mode noise can be caused by a "noisy" AC/DC power supply or by other devices, such as a car dock that isolates an electronic device and creates a poor reference to ground.
• Other influences that can affect the performance of a capacitive touch interface are docking stations, car kits, HDMI and USB cables that are connected to a device, and other accessories that create an alternate or poor reference to ground.
• AC/DC power supply also commonly referred to as a wall adapter
• a manufacturer-provided AC/DC power supply may be designed for no more than a one (1) volt peak-to-peak maximum.
• a user When a user loses or misplaces the original equipment AC/DC power supply that is provided with a device, the user will typically replace the lost power supply with any one of many low-cost, aftermarket units that are available from any number of different sources.
• an aftermarket AC/DC power supply may allow as much as twenty-five (25) volt peak-to-peak common mode noise.
• FIG. 1 illustrates an example system in which embodiments of battery charging interrupt can be implemented.
• FIG. 2 illustrates an example powered device in which embodiments of battery charging interrupt can be implemented based on an increase and/or decrease of common mode noise.
• FIG. 3 illustrates a representation of a software controlled charging circuit implemented in an example powered device according to some embodiments of battery charging interrupt.
• FIG. 4 illustrates a representation of an electronically switched charging circuit implemented in an example powered device in embodiments of battery charging interrupt.
• FIG. 5 illustrates a representation of a switched charging circuit implemented in an example powered device using embodiments of battery charging interrupt.
• FIG. 6 illustrates example method(s) of battery charging interrupt in accordance with one or more embodiments.
• FIG. 7 illustrates various components of an example electronic device that can implement embodiments of battery charging interrupt.
• a powered device includes a charging circuit that charges a battery of the device when a power supply (also commonly referred to as a wall adapter) couples the charging circuit to a power source.
• a power supply also commonly referred to as a wall adapter
• a mobile phone can be plugged-in to an AC power source to charge the battery of the device and/or to power the device.
• a user may utilize a third-party or aftermarket, AC/DC power supply that can introduce unwanted noise when coupled to the device, rather than using a manufacturer- provided power supply that meets the electronic device specifications to charge the device battery without introducing the unwanted noise.
• Embodiments of battery charging interrupt balances the need to charge the battery of a device against the level of broadband noise that may be introduced when the device is coupled to a power supply that does not meet the electronic device manufacturer's specifications.
• the level of electrical noise e.g., broadband noise, narrowband noise, or common mode noise
• the charge level of the battery can also be determined before a battery charging interrupt is initiated.
• the level of common mode noise for example, exceeds the noise level threshold and the charge level of the battery exceeds a minimum charge level
• the battery charging can be interrupted to reduce the unwanted common mode noise.
• the battery charging can be interrupted by isolating the charging circuit of the device from the power source. Charging the battery can be resumed when the user contact is lifted from the capacitive touch interface of the device.
• the battery charging is only disabled while there is user contact (e.g., a conductive contact) on the capacitive touch interface. This allows the signal-to-noise ratio to increase (by decreasing the noise during the user contact) and supports the touch detection system operating with greater reliability.
• user contact e.g., a conductive contact
• FIG. 1 illustrates an example system 100 in which embodiments of battery charging interrupt can be implemented.
• the example system 100 includes a powered device 102 that may be any type of portable electronic device, such as a mobile phone, handheld navigation device, portable gaming device, and/or portable media playback device.
• the powered device may also be any type of device as further described with reference to the example electronic device shown in FIG. 7.
• the powered device 102 includes a capacitive touch interface 104(also referred to as a touch-screen) and includes a touch detection system 106 that detects a conductive contact on the touch interface, such as a user contact of an image that is displayed on the touch interface.
• the powered device 102 includes a charging circuit 108 that charges a battery 1 10 of the device when the charging circuit is coupled to a power source 1 12, such as an electrical mains wall power source.
• a power supply 1 14 e.g., a switched-mode AC-to-DC wall adapter
• the power source 1 12 e.g., a 60 Hz AC power source
• the DC power from the power supply 1 14 is coupled to the charging circuit 108 of the device via a charger cable 1 16 to charge the battery 1 10 and/or to power the device.
• the charging circuit 108 may be integrated in a system-on-chip (SoC) with other components and/or logic of the device, or alternatively, may be implemented as a circuit of the power supply 1 14 that is external to the powered device 102.
• SoC system-on-chip
• the power supply includes a transformer having a transformer primary 120 that couples to the external power source 1 12 and a transformer secondary 122 that couples to the device charging circuit 108 via the charger cable 1 16.
• the power supply 1 14 also includes a switch 124 that opens and closes to regulate an output voltage based on device loading.
• a user may utilize a third-party or aftermarket, power supply (e.g. , wall adapter) that can introduce unwanted noise when coupled to the device, rather than using a manufacturer-provided power supply that meets the electronic device manufacturer's specifications to charge the device battery without introducing the unwanted noise.
• an increase in common mode noise may cause the touch detection system 106 to detect false or jittery touch signals.
• Broadband noise interferes with the touch interface when the magnitude of the electric field from the noise is comparable to the magnitude of the electric field produced by the touch interface's transmitters.
• a detection threshold can be raised above the noise threshold while a conductive contact is detected. This detection threshold can rise and fall based on electrical measurements of untouched portions of the touch interface, and can provide an indication of the impact of the noise during detection of the conductive contact.
• the touch detection system 106 detects a user contact on the capacitive touch interface 104, the touch detection system also determines the level of noise on the capacitive touch interface.
• the touch detection system can detect common mode noise by detecting and measuring a signal component common to several nodes on the touch panel.
• common mode noise will likely be the dominant noise source and the level of the common mode noise can be attributed to the power supply.
• the powered device 102 also includes a device controller 126 that is implemented to determine whether the level of common mode noise exceeds a noise level threshold 128, and whether to interrupt the battery charging.
• the noise level threshold 128 can represent more than one type of electrical noise (e.g., broadband noise, narrowband noise at particular frequencies, common mode noise, etc.)and more than one level of noise.
• Various threshold values can be fixed values stored in a memory table or dynamically generated based on several factors, such as electrical noise measurements or the presence of conditions known to cause noise, such as a connection to a power supply, connection to an active HDMI monitor, and the like.
• the device controller 126 can then determine whether to interrupt the battery charging to reduce the level of common mode noise.
• the device controller can also initiate a circuit interrupt contrail 30 to interrupt the battery charging and/or to isolate the charging circuit 108 from the power supply 114.
• the device controller 126 can initiate the circuit interrupt control 130 to switch a circuit interrupt that is positioned between the charging circuitl08 and the power supply 1 14 to isolate the charging circuit 108 from the power supply 114 when the level of common mode noise exceeds the noise level threshold 128.
• both the high and low leads of the power supply 114 are isolated to disable the battery charging and prevent a ground loop through the low lead.
• the device controller 126 can initiate the circuit interrupt control 130 to initiate a low-frequency, switched mode (or pulse-skipping mode) of the switched-mode power supply 114 to reduce the common mode noise.
• the circuit interrupt control 130 may also be implemented to reduce the input current drawn from the power supply 114 by the charging circuit in the mobile device.
• the device controller 126 is also implemented to determine a charge level of the battery 110 before interrupting the battery charging. For example, the device controller can determine whether the level of common mode noise exceeds the noise level threshold 128, and then determine a charge level of the battery when the level of common mode noise exceeds the noise level threshold. The device controller can then either increase the noise level threshold when the charge level of the battery is below a minimum charge level, or interrupt the battery charging when the level of common mode noise exceeds the noise level threshold and the charge level of the battery exceeds the minimum charge level.
• charging the battery 110 is resumed when the conductive contact is removed from the capacitive touch interface 104.
• the battery charging is only disabled while there is contact on the capacitive touch interface.
• the touch detection system 106 is implemented to detect that a conductive contact on the capacitive touch interface has ended, and then the device controller 126 again couples the charging circuit 108 to the power supply 114.
• the device controller can cancel the circuit interrupt control 130, initiate a circuit resume control, time-out the circuit interrupt, or initiate any other type of control to resume charging the battery.
• a user interface notification may be displayed to indicate to a user that there is not an intermittent charging problem each time the capacitive touch interface is contacted and the battery charging interrupted.
• FIG. 2 illustrates examples of the powered device 102 in which embodiments of battery charging interrupt can be implemented based on an increase and/or decrease of common mode noise.
• the powered device 102 includes the capacitive touch interface 104 and touch detection system 106 (shown in FIG. 1).
• touch detection system 106 shown in FIG. 1
• the chassis of the device is conductive then, either directly or indirectly (including inductively), it is likely to be coupled to the device charging circuit 108 (shown in FIG. 1).
• the touch detection system 106 can determine a common mode noise decrease 214, and the device controller 126 can then decrease the noise level thresholdl28.
• the chassis of a device may also be referred to as a housing portion, an outer casing, a shell, or other similar structures that define a form factor of the device and that a user contacts when holding the device.
• a user may initiate contact with the capacitive touch interface 104 of the device 102 without holding the device in the other hand (such as shown in the other example 200) or generally, without contacting the chassis of the device, which would otherwise capacitively couple the device to ground.
• a mobile phone with a capacitive touch interface may be plugged-in to a power source through a power supply and placed on a wooden desk or table. The user may then initiate contact on the device with one hand without picking up the device in the other hand.
• the touch detection system 106 can determine if a common mode noise increase 220 has occurred.
• FIG. 3 illustrates a representation 300 of a software controlled charging circuit 302 that is implemented in the example powered device 102 and coupled to the power supply 114 to charge the battery 110 in embodiments of battery charging interrupt.
• the device controller 126 is implemented to initiate the circuit interrupt control 130 to a power management integrated circuit (PMIC) 304 to interrupt charging the battery by placing the switched-mode power supply that is coupled to the power source into a low-frequency, switched mode(or pulse-skipping mode), which reduces noise susceptibility of the capacitive touch interface 104 of the device.
• PMIC power management integrated circuit
• FIG. 4 illustrates a representation 400 of an electronically switched charging circuit 402 that is implemented in the example powered device 102 and coupled to the power supply 114 to charge the battery 110 in embodiments of battery charging interrupt.
• the device controller 126 is implemented to initiate the circuit interrupt control 130 to a PMIC 404 that controls a switch 406 to interrupt charging the battery by isolating the charging circuit 402 from the power supply as represented by an isolation barrier 408 that also isolates data and other lines (e.g., USB lines D+ and D-).
• FIG. 5 illustrates a representation 500 of a switched charging circuit 502 that is implemented in the example powered device 102 and coupled to the power supply 114 to charge the battery 110 in embodiments of battery charging interrupt.
• the device controller 126 is implemented to initiate the circuit interrupt control 130 to a PMIC504 that controls switches 506 and 508 to interrupt charging the battery by isolating the charging circuit 502 from the power supply as represented by an isolation barrier 510 that also isolates data and other lines (e.g., USB lines D+ and D-).
• a micro-electro-mechanical systems (MEMS) switching system is implemented, but other types of switching systems may be used.
• MEMS micro-electro-mechanical systems
• FIG. 6 illustrates example method(s) 600 of battery charging interrupt.
• a device battery is charged using a charging circuit that is coupled to a power source.
• the power supply 114 couples the power source 112 to the charging circuit 108 of the powered device 102 to charge the device battery 1 10.
• the charging circuit 108 include the software controlled charging circuit 302 (FIG. 3), the electronically switched charging circuit 402 (FIG. 4), and the switched charging circuit 502 (FIG. 5)
• the touch detection systeml06 of the powered device 102 can detect when the chassis 208(FIG. 2) of the powered device 102 is capacitively coupled to ground, such as when a user holds the device making contact with the chassis. If the chassis of the device is capacitively coupled to ground (i.e., yes from block 604), then at block 606, the noise level threshold is decreased.
• the device controller 126 decreases the noise level threshold 128 when the touch detection system 106 determines the common mode noise decrease 214 caused by grounding a conductive chassis of the electronic device.
• a lower noise level threshold is to make the touch detection system 106 more sensitive to smaller-surface-area contact.
• a lower noise level threshold also makes the touch detection system 106 more susceptible to false-positive "touches" caused by noise.
• lowering the noise level threshold when the device chassis is coupled to ground takes advantage of a circumstance where noise is less likely to create false positives.
• a level of noise is determined in response to detection of the contact.
• the touch detection systeml06 of the powered device 102 measures the level of noise, such as common mode noise, when the contact is detected on the capacitive touch interface 104 of the device.
• the noise level threshold may be decreased as described with reference to block 606 above (i.e., when the device chassis is coupled to ground, which decreases the common mode noise); or the noise level threshold may be increased as described with reference to block 620 below (i.e., when the noise level threshold is exceeded and the battery charge level is low).
• the noise level threshold is exceeded (i.e., yes from block 612)
• the device controller 126 of the powered device 102 interrupts the battery charging by switching a circuit interrupt between the charging circuit and the power source to isolate the charging circuit from the power source, or by initiating a low-frequency, switched mode(or pulse-skipping mode) of the power supply to interrupt charging the battery.
• the device controller 126 initiates the circuit interrupt control 130 to the PMIC 304 (FIG. 3) to interrupt charging the battery by placing the power supply that is coupled to the power source in a low-frequency, switched mode(or pulse-skipping mode).
• the device controller 126 initiates the circuit interrupt control 130 to the PMIC 404 (FIG.
• device controller 126 initiates the circuit interrupt controll30 to the PMIC504 (FIG. 5) that controls switches 506 and 508 to interrupt charging the battery by isolating the charging circuit 502 from the power source.
• the method continues at block 608 to determine whether the contact is still detected on the capacitive touch interface of the device. For example, the touch detection system 106 of the powered device 102 detects that the contact on the capacitive touch interface 104 has ended. The device controller 126 then couples the charging circuitl08 to the power supply 114, and the method continues at block 602 to resume charging the device battery.
• the noise level threshold is increased when the charge level of the battery is below the minimum charge level.
• the effect of a higher noise level threshold is to make the touch detection system 106 less sensitive to smaller-surface-area contact (i.e., a larger surface-area contact is needed before the touch detection system 106 registers a touch).
• a higher noise level threshold also makes the touch detection system 106 less susceptible to false-positive "touches" caused by noise.
• increasing the noise level threshold when the common mode noise is measured as high reduces false positives, which are more likely in a high noise environment.
• FIG. 7 illustrates various components of an example electronic device 700 that can be implemented as a powered device as described with reference to any of the previous FIGs. 1-6.
• the device may be implemented as any one or combination of a fixed or mobile device, in any form of a consumer, computer, portable, user, communication, phone, navigation, gaming, messaging, Web browsing, paging, media playback, and/or other type of electronic device, such as the powered device 102 described with reference to FIG. 1.
• the electronic device 700 includes communication transceivers 702 that enable wired and/or wireless communication of device data 704, such as received data and transmitted data.
• Example communication transceivers include wireless personal area network (WPAN) radios compliant with various IEEE 802.15
• BluetoothTM wireless local area network
• WLAN wireless local area network
• WiFiTM wireless local area network
• WiMAXTM wireless wide area network
• LAN wired local area network
• the electronic device 700 includes a touch detection system 706, such as the touch detection system 106 described with reference to FIG. 1.
• the touch detection system is implemented to detect and/or sense conductive contacts, such as when initiated by a user as a selection input on the capacitive touch interface 104 that is integrated with the device.
• the electronic device 700 also includes a charging circuit 708, such as the charging circuit 108 described with reference to FIG. 1, that couples a battery 710 to an external power supply to charge the battery.
• the electronic device 700 may also include one or more data input ports 712 via which any type of data, media content, and/or inputs can be received, such as user-selectable inputs, messages, music, television content, recorded video content, and any other type of audio, video, and/or image data received from any content and/or data source.
• the data input ports 712 may include USB ports, coaxial cable ports, and other serial or parallel connectors (including internal connectors) for flash memory, DVDs, CDs, and the like. These data input ports may be used to couple the electronic device to components, peripherals, or accessories such as keyboards, microphones, or cameras.
• the electronic device 700 of this example includes one or more processors 714 (e.g., any of microprocessors, controllers, and the like), or a processor and memory system (e.g., implemented in an SoC), which process computer- executable instructions to control operation of the device.
• processors 714 e.g., any of microprocessors, controllers, and the like
• processor and memory system e.g., implemented in an SoC
• the electronic device can be implemented with any one or combination of software, hardware, firmware, or fixed logic circuitry that is implemented in connection with processing and control circuits, which are generally identified at 716.
• the electronic device can include a system bus or data transfer system that couples the various components within the device.
• a system bus can include any one or combination of different bus structures, such as a memory bus or memory controller, a peripheral bus, a universal serial bus, and/or a processor or local bus that utilizes any of a variety of bus architectures.
• the electronic device 700 also includes one or more memory devices 718 that enable data storage, examples of which include random access memory (RAM), non- volatile memory (e.g., read-only memory (ROM), flash memory, EPROM, EEPROM, etc.), and a disk storage device.
• RAM random access memory
• non- volatile memory e.g., read-only memory (ROM), flash memory, EPROM, EEPROM, etc.
• ROM read-only memory
• flash memory e.g., EPROM, EEPROM, etc.
• EEPROM electrically erasable programmable read-only memory
• a memory device 718 provides data storage mechanisms to store the device data 704, other types of information and/or data, and various device applications720 (e.g., software applications).
• an operating system722 can be maintained as software instructions with a memory device and executed by the processors 714.
• the electronic device 700 includes a device controller 726, such as the device controller 126 described with reference to FIG. 1.
• the device controller may be implemented as any form of a control application, software application, signal-processing and control module, firmware that is installed on the device, a hardware implementation of the controller, and so on.
• the electronic device 700 also includes an audio and/or video processing system 724 that processes audio data and/or passes through the audio and video data to an audio system 728 and/or to a display system 730.
• the audio system and/or the display system may include any devices that process, display, and/or otherwise render audio, video, display, and/or image data.
• Display data and audio signals can be communicated to an audio component and/or to a display component via an RF (radio frequency) link, S-video link, HDMI (high-definition multimedia interface), composite video link, component video link, DVI (digital video interface), analog audio connection, or other similar communication link, such as media data port 732.
• the audio system and/or the display system are external components to the electronic device.
• the display system can be an integrated component of the example electronic device, such as part of an integrated touch interface.
• the display system can be an integrated component of the example electronic device, such as part of an integrated touch interface.

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• General Physics & Mathematics (AREA)
• Power Engineering (AREA)
• Human Computer Interaction (AREA)
• Charge And Discharge Circuits For Batteries Or The Like (AREA)

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